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Rhenium Electrodeposition and Its Electrochemical Behavior in Molten KF-KBF(4)-B(2)O(3)-KReO(4)
The electrochemical behavior of rhenium ions in the molten KF-KBF(4)-B(2)O(3) salt was systematically studied, and pure metallic rhenium was obtained at the cathode. The processes of rhenium ions reduction and diffusion in molten KF-KBF(4)-B(2)O(3) were determined using cyclic voltammetry, stationar...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9738642/ https://www.ncbi.nlm.nih.gov/pubmed/36500174 http://dx.doi.org/10.3390/ma15238679 |
Sumario: | The electrochemical behavior of rhenium ions in the molten KF-KBF(4)-B(2)O(3) salt was systematically studied, and pure metallic rhenium was obtained at the cathode. The processes of rhenium ions reduction and diffusion in molten KF-KBF(4)-B(2)O(3) were determined using cyclic voltammetry, stationary galvanostatic and polarization curves analyses. The values of diffusion coefficients were 3.15 × 10(−5) cm(2)/s and 4.61 × 10(−5) cm(2)/s for R(1) and R(2,) respectively. Rhenium electrodeposition was carried out at a constant potential. The process of rhenium cathode reduction in KF-KBF(4)-B(2)O(3) at 773 K was found to be a one-step reaction Re(VII) → Re, and rhenium electrodeposition presumably occurred from two types of complex rhenium ions (KReO(4) and K(3)ReO(5)). Both processes are quasi-reversible and controlled by diffusion. The obtained cathode deposit was analyzed by SEM, EDX, ICP-OES and XRD methods. The obtained deposit had a thread structure and rhenium was the main component. |
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